Tokyo Virus

Virus Name: Tokyo Aliases: V Status: Rare Discovery: August, 1991 Symptoms: .EXE file growth; system hangs; programs may not function properly Origin: Japan Eff Length: 1,258 - 1,273 Bytes Type Code: PNE - Parasitic Resident .EXE Infector Detection Method: ViruScan, Sweep, IBMAV, NAV, NAVDX, VAlert, PCScan, F-Prot, AVTK 7.68+, NShld, Sweep/N, IBMAV/N, NAV/N, LProt, AVTK/N 7.68+ Removal Instructions: Delete infected files General Comments: The Tokyo virus was discovered in Japan in August, 1991. Tokyo is a non-resident direct action infector of .EXE programs. When a program infected with Tokyo is executed, the virus may infect one .EXE file in the current directory. Infected .EXE programs will increase in size by 1,258 to 1,273 bytes, with the virus being located at the end of the infected file. Systems infected with Tokyo may experience frequent system hangs when attempts are made to execute infected programs. When the system hang does not occur, often the infected program will not behave as the user is expecting, with pauses occurring in output operations, such as to the system display. It is unknown if Tokyo does anything besides replicate.